anti ddos vps

Defense against DDOS attacks # lightweight prevention of SYN Attacks iptables-N syn-flood iptables-a input-p tcp -- syn-j syn-flood iptables-I syn-flood-p tcp- m limit -- limit 3/s -- limit-burst 6-j RETURN iptables-A syn-flood-j REJECT # prevent too many DOS connections, each IP address of an Internet Nic can have up to 15 Initial connections, discarded iptables-a input-I eth0-p tcp -- syn-m connlimit -- connlimit-abve 15-j DROP iptables-A INPUT-p tc

Anti-DDoS script # Lightweight prevention against SYN AttacksIptables-N syn-floodIptables-A input-p tcp-syn-J syn-floodIptables-I syn-flood-P TCP-m limit-limit 3/s-limit-burst 6-J returnIptables-a syn-flood-J reject # Prevent too many Dos connections. You can allow up to 15 Initial connections from each IP address of the Internet Nic, exceeding the limit of discardingIptables-A input-I eth0-P TCP-syn-M conn

security, you can set the maximum connection, single IP connection, and blacklist!Maximum connections:7000-> 30000 (LoginGate) is set to 40 single IP connection is set to: 207100-> 31000 (SelChrGate) is set to 30 single IP connection is set to: 207200-> 32000 (RunGate) is set to 1000 Single IP connection is set to: 20In this way, we can effectively prevent DDOS attacks or other variant attacks!Defends against SYN attacks!You can set an IP address seg

ZOJ 3868 (Anti-DDoS principle + fast power) GCD Expectation Time Limit: 4 Seconds Memory Limit: 262144 KB Edward has a setNIntegers {A1,A2 ,...,AN}. He randomly picks a nonempty subset {X1,X2 ,...,XM} (Each nonempty subset has equal probability to be picked), and wowould like to know the expectation [Gcd(X1,X2 ,...,XM)]K. Note thatGcd(X1,X2 ,...,XM) Is the greatest common divisor {X1,X2 ,...,XM}

Enable NGINX anti-CC and DDOS Attack ModuleHttpLimitZoneModule configuration instructions This module makes it possible to limit the number of simultaneous connections for the assigned session or as a special case, from one address. Example configuration Http {limit_zone one $ binary_remote_addr 10 m; server {location/download/{limit_conn one 1 ;}}} HttpLimitReqModule configuration instructions This mo

The application of the anti-DDoS principle and SQL in keywords in EF, sqlef Suddenly realized the importance of words, so I began to write my first blog, with the goal of keeping a close record for ease of understanding. At the same time, I also hope that the brick-and-mortar market can play a role in promoting mutual learning. You are welcome to express your thoughts and thoughts! Background: During the el

The PHP anti-DDoS attack instance code is as follows:

Previous Article: http://www.bkjia.com/Article/201110/109182.htmlInstallation Method:1. Download the compressed package in the attachment, decompress it, and copy mod_dosevasive22.dll to the modules directory under the Apache installation directory (of course, it can also be another directory and you need to modify the path yourself ).2. Modify the Apache configuration file http. conf.Add the following contentLoadModule dosevasive22_module modules/mod_dosevasive22.dllDOSHashTableSize 3097DOSPage

Anti-DDoS, complete registry settings Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE/system/CurrentControlSet/services/TCPIP/parameters] Disable the invalid gateway check. When the server is configured with multiple gateways, the system will try to connect when the network is not smooth.The second gateway can optimize the network by disabling it.EnableDeadGWDetect = DWORD: 00000000. Disable res

ZOJ 3868 (Anti-DDoS principle + fast power), zoj3868 GCD Expectation Time Limit: 4 Seconds Memory Limit: 262144 KB Edward has a setNIntegers {A1,A2 ,...,AN}. He randomly picks a nonempty subset {X1,X2 ,...,XM} (Each nonempty subset has equal probability to be picked), and wowould like to know the expectation [Gcd(X1,X2 ,...,XM)]K. Note thatGcd(X1,X2 ,...,XM) Is the greatest common divisor {X1,X2

Tags: bzoj, bzoj3589, principle of tree link partitioning and rejection Given a 1-Root tree, each node has a certain privilege and provides two operations: 1. All node weights of the subtree with a node as the root + x 2. Obtain the vertices and consortium of some links. These links are directed to the root node from a node. First, modify the sub-tree, query the link, and split the wt ~ Then, the point permissions of each vertex on these links can only be added once, and cannot be marked. Due to

Several anti-DDoS Methods 1) Use the findwindow API function.You can query the window title (or/and Class Name) to determine whether the program is running. If it is found, it indicates that the program is running, and you can exit the program to achieve the effect of not repeating the operation; otherwise, it indicates that the program is running for the first time.This method is not applicable to situati

Anti-DDoS: CC attack defense system deployment1. System effect this DDOS Application Layer defense system has been deployed on the http://www.yfdc.org site (if access fails, please directly access the server in China http: // 121.42.45.55 for online testing ). The defense system is at the application layer, which effectively prevents the abuse of server resources

Amazon anti-DDoS: Remove device encryption in the latest Fire Tablet System Just as Apple and the FBI are in a fierce battle for device encryption, another tech giant, Amazon, has reversed its path and removed the device encryption feature from the latest Fire Tablet system.User: Why can't I find the encryption function? Recently, many users have found that the encryption function cannot be found after

downlink PC or hub. do not enable this function at the uplink port of the access switch. Rujijie (config-if-range) # rldp port loop-detect shutdown-port ------> the interface enables the rldp function. If the port is showdow after the loop is detected Rujijie (config-if-range) # exit Rujijie (config) # errdisable recovery interval 300 ------> If the port is detected and shut down by rldp, it will be restored automatically in 300 seconds and re-detect whether a loop exists Rujijie (config) # End

Anti-DDoS program module indirectly transmits STL instance objects through struct We often pass parameters to functions through struct. In principle, the struct should not contain non-pod members. [Reference]========================================================== ==========================================Pod, short for plain old data, a common old data structure (POD) is a data structure. It is used only

#!/bin/sh#date:2015-12-13#filename:fang-dos.sh #version: v1.0while truedo #awk ' {print $} ' Access_2015-12-15.log|grep-v "^$" |sort|uniq-c >/tmp/tmp.log netstat-an|grep est|awk-f ' [:]+ ' { Print $6} ' |sort|uniq-c >/tmp/tmp.log exec For more information, please visit Li Hing Lee BlogShell anti-DDoS attack principle

does not change)4ID Test # To see if the add succeededModify the/etc/ssh/sshd_config file1 vim/etc/ssh/sshd_configLocate the following line and change the permitrootlogin after yes to No to prevent the root user from logging in remotely1 permitrootlogin NoRestart the SSH service, and then login to the VPS with a new normal userThird, installation denyhosts anti-violence attackDenyHosts is a log-based intru

Linux VPS System anti-CC attack automatic pull black IP script is divided into 2 versions, the normal version is added to the crontab scheduled tasks performed every 5 minutes. Enhanced version is mainly to make up for the use of crontab execution time interval is only a minimum of 1 minutes, you can make CC protection more stringent, even every 1S execution once! Function Description: Through the Netstat-